Utility vehicle

ABSTRACT

A utility vehicle of the present invention comprises a chassis; and a R.O.P.S. provided on the chassis and surrounding a cabin, wherein the R.O.P.S. includes a pair of left and right front pillars, a pair of left and right side beams, a pair of left and right rear pillars, and a front beam and a rear beam which extend in a width direction of a vehicle body, a rear support supporting the R.O.P.S. from a rear is connected to a rear portion of the chassis, and a rear end of the side beam, a side end of the rear beam, an upper end of the rear pillar, and a front end of the rear support are connected by a connecting portion.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a utility vehicle.

2. Description of the Related Art

A utility vehicle has been known that enhances the running performance on rough terrains. It is disclosed that a R.O.P.S. (Roll-Over Protective Structure) for protecting a cabin is provided on a chassis in a utility vehicle (for example, US2015/0259011 A1, and the like).

Since a utility vehicle travels on rough terrains such as fields and mountains, wasteland, sloping land and the like which are not paved, the utility vehicle has a risk of unexpected falling down. Therefore, a utility vehicle may be provided with a R.O.P.S. to protect an occupant in case of unexpected falling down. A R.O.P.S. is constituted by a framework including, for example, four front, rear, right and left pillars, and multiple beams connecting the pillars. As rigidity of a R.O.P.S. is enhanced, deformation of the R.O.P.S. is suppressed and safety of an occupant can be further improved.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a utility vehicle including a R.O.P.S. in which rigidity is enhanced.

In. order to achieve the above object, according to one aspect of the present invention, a utility vehicle comprising:

a chassis; and

a R.O.P.S. provided on the chassis and surrounding a cabin, wherein

the R.O.P.S. includes a pair of left and right front pillars, a pair of left and right side beams, a pair of left and right rear pillars, and a front beam and a rear beam which extend in a width direction of a vehicle body,

wherein a rear support supporting the R.O.P.S. from a rear is connected to a rear portion of the chassis, and

wherein a rear end of the side beam, a side end of the rear beam, an upper end of the rear pillar, and a front end of the rear support are connected by a connecting portion.

According to one aspect of the present invention, since the rear support which supports the R.O.P.S. from the rear and is connected to the rear portion of the chassis, and the R.O.P.S. are connected by the connecting portion, when stress in a longitudinal direction of the vehicle body, in a width direction of the vehicle body and in a height direction of the vehicle body is applied to the R.O.P.S., stress is dispersed to the chassis via the connecting portion and the rear support, and thereby rigidity of the R.O.P.S. is enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects and features of the present invention will become apparent from the following description taken in conjunction with the preferred embodiments thereof with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a utility vehicle according to one embodiment of the present invention as viewed from a front left side;

FIG. 2 is a perspective view of a chassis and a R.O.P.S. of the utility vehicle shown in FIG. 1 as viewed from a right rear side;

FIG. 3 is a left side view of the chassis and the R.O.P.S. shown in FIG. 2;

FIG. 4 is a perspective view of a portion of the R.O.P.S. shown in FIG. 2 as viewed from a front left side;

FIG. 5 is a perspective view in which the R.O.P.S. shown in FIG. 2 is developed;

FIG. 6 is a developed view of the vicinity of a curved portion of a front side roof of the R.O.P.S. shown in FIG. 2;

FIG. 7 is a developed view of the vicinity of a connecting portion at a rear side of the R.O.P.S. shown in FIG. 2;

FIG. 8 is a perspective view of a state in which a rear support is removed from the R.O.P.S. shown in FIG. 2;

FIG. 9 is a rear perspective view of a R.O.P.S.;

FIG. 10 is a view of a connecting structure by a connecting portion as viewed from the outside in a width direction of a vehicle body;

FIG. 11 is a view of a connecting structure by a connecting portion as viewed from the inside in a width direction of a vehicle body;

FIG. 12 is a perspective view of a side beam;

FIG. 13 is a perspective view of a rear pillar;

FIG. 14 is a perspective view of a rear support in which a connecting portion is integrated;

FIG. 15 is a perspective view of a bracket used for a side beam, a rear pillar and a rear support;

FIG. 16 is a perspective view of a connecting portion;

FIG. 17 is a view of a connecting portion integrated with a rear support as viewed from the inside in a width direction of a vehicle body; and

FIG. 18 is a perspective view of a connecting portion shown in FIG. 17.

DETAILED DESCRIPTION OF THE INVENTION

With reference to the attached drawings, a utility vehicle 1 according to one embodiment will be described. The utility vehicle 1 is a vehicle for mainly traveling on rough terrains such as fields and mountains, wasteland, sloping land and the like which are not paved. For convenience of explanation, a traveling direction of the utility vehicle 1 is set to be a “front side” of the utility vehicle 1 and each constitutional element, a reverse direction of the traveling direction of the utility vehicle 1 is set to be a “rear side” of the utility vehicle 1 and each constitutional element and left and right sides in a width direction of a vehicle body as viewed from an occupant are set as “left and right sides” of the utility vehicle 1 and each constitutional element.

<Overall Structure of Vehicle>

FIG. 1 is a perspective view of the utility vehicle 1 according to one embodiment of the present invention as viewed from a front left side.

As shown in FIG. 1, the utility vehicle 1 includes a chassis 2 and a R.O.P.S. 5 provided on the chassis 2. The chassis 2 is a vehicle body framework part other than the R.O.P.S. 5. A pair of left and right front wheels 3 is supported at a front part of the chassis 2, and a pair of right and left rear wheels 4 is supported at a rear part of the chassis 2.

The R.O.P.S. (Roll-Over Protective Structure) 5 is a frame structure provided on the chassis 2 to protect a cabin (or riding space) S from impact. The cabin S is a space where the occupant gets on. The cabin S is located between the right and left front wheels 3 and the left and right rear wheels 4. A carrier 6 is disposed at a rear side of the cabin S, and a bonnet 7 is disposed at a front side of the cabin S. In the cabin S, a pair of left and right sheets 8 of an independent type is disposed. A steering wheel and a dash panel are disposed in front of the seats 8. For example, an engine (not shown) is disposed from a space below the seats 8 to a space below the front portion of the carrier 6. As an optional accessory member, in addition to a door 9, a windshield 91, a roof 92, a rear windshield 93 and the like which will be described later can be mounted to the R.O.P.S. 5.

<Structure of Chassis>

FIG. 2 is a perspective view of the chassis 2 and the R.O.P.S. 5 of the utility vehicle 1 shown in FIG. 1 as viewed from a right rear side. FIG. 3 is a left side view of the chassis 2 and the R.O.P.S. 5 shown in FIG. 2. As shown in FIGS. 2 and 3, the chassis 2 is constituted by combining multiple pipe members and plate members. The pipe members constituting the chassis 2 have, for example, a rectangular or circular cross section and are made of metal. The chassis 2 has a pair of right and left main frames 21, a pair of left and right side frames 22, a pair of left and right front frames 23, a pair of left and right rear frames 24, and a rear cross member 27.

In the present application, based on a cross member of the chassis 2 to which a constitutional element located most rearward in a longitudinal direction of the vehicle body among the R.O.P.S. 5 is connected, specifically based on the rear cross member 27, the front and rear sides in the longitudinal direction of the vehicle body than the rear cross member 27 are defined as a front portion 2F and a rear portion 2R of the chassis 2, respectively. Therefore, in the present application, for example, the side frame 22 corresponds to the front portion 2F of the chassis 2, and the rear frame 24 corresponds to the rear portion 2R of the chassis 2.

The main frame 21 forms a framework of the chassis 2 and extends in the longitudinal direction of the vehicle body (front-rear direction of the vehicle body). On a lateral side of the main frame 21, the side frame 22 is disposed. On a front upper part of the main frame 21, the front frame 23 is erected. On a rear upper part of the main frame 21, the rear frame 24 is erected. The main frame 21, the side frame 22, the front frame 23 and the rear frame 24 are configured to be substantially symmetrical with respect to a width direction of the vehicle body (left-right direction of the vehicle body). At least one cross bar (no reference number) is provided between the pair of left and right main frames 21, between the main frame 21 and the side frame 22, between the pair of left and right front frames 23, and between the pair of left and right rear frames 24, respectively. By connecting each frame to the cross bar in the width direction of the vehicle body, rigidity in the width direction of the vehicle body is enhanced.

The side frame 22 is positioned outside the width direction of the vehicle body with respect to the main frame 21, and is connected to the main frame 21 by multiple cross bars (no reference number). The side frame 22 extends in the longitudinal direction of the vehicle body as a whole, and is approximately U-shaped in side view. The side frame 22 has a front end 22 f at the front side in the longitudinal direction of the vehicle body and above a height direction of the vehicle body (vertical direction of the vehicle body). The side frame 22 has a rear end 22 r at the rear side in the longitudinal direction of the vehicle body and above the height direction of the vehicle body.

The front frame 23 includes a front longitudinal frame portion 23 a, a central oblique frame portion 23 b, and a front oblique frame portion 23 c. The front longitudinal frame portion 23 a extends in the height direction of the vehicle body. The central oblique frame portion 23 b extends upward and obliquely rearward from the front longitudinal frame portion 23 a. The front oblique frame portion 23 c extends toward the outside in the width direction of the vehicle body and obliquely upward and rearward from the central oblique frame portion 23 b. A front end (no reference number) of the front longitudinal frame portion 23 a is fixed to a front end (no reference number) of the main frame 21 by welding and the like. A rear end (no reference number) of the front oblique frame portion 23 c is fixed to a front cross member 25 by welding and the like. The front cross member 25 extends in the width direction of the vehicle body, and is approximately U-shaped in front view. The front cross member 25 is supported by a front support frame 26 erected obliquely frontward at a front portion of the main frame 21.

The rear frame 24 is positioned at the rear portion 2R of the chassis 2, extends in the longitudinal direction of the vehicle body as a whole, and is curved to be approximately L-shaped in side view. The rear frame 24 includes a rear upper frame portion 24 a, a rear longitudinal frame portion 24 b, and a rear curved frame portion 24 c. The rear upper frame portion 24 a extends in the longitudinal direction of the vehicle body. The rear vertical frame portion 24 b extends obliquely in the height direction of the vehicle body and inward in the width direction of the vehicle body. The rear curved frame portion 24 c is curved so as to connect the rear upper frame portion 24 a to the rear longitudinal frame portion 24 b. In the rear frame 24, a rear end 24 r of the rear longitudinal frame portion 24 b is fixed to a rear end 21 r of the main frame 21 by welding and the like. A front end (no reference number) of the rear upper frame portion 24 a is fixed to the rear cross member 27 by welding and the like.

The rear cross member 27 is, for example, a hollow pipe having a rectangular cross section. The rear cross member 27 has a rear lateral bar portion 27 a and left and right rear oblique bar portions 27 b. The rear lateral bar portion 27 a is positioned at a center of the rear cross member 27 and extends in the width direction of the vehicle body. The rear oblique bar portion 27 b is located at a lateral side of the rear lateral bar portion 27 a, and extends obliquely from the rear side to the front side toward the outside in the width direction of the vehicle body. The rear lateral bar portion 27 a of the rear cross member 27 is supported by a rear support frame 28 erected obliquely rearward in the main frame 21.

A front bracket 29 a of the front cross member 25 is fixed to left and right side ends 25 s of the front cross member 25 by welding and the like. The front bracket 29 a is fixed to the front end 22 f of the side frame 22, for example, by bolts and the like. In the rear cross member 27, left and right front ends 27 f of the rear oblique bar portion 27 b are fixed to the rear end 22 r of the side frame 22 via the rear bracket 29 b, for example, by bolts 60 and the like.

<Structure of R.O.P.S.>

With reference to FIGS. 2 to 8, a structure of the R.O.P.S. 5 will be described. FIG. 4 is a perspective view of a portion of the R.O.P.S. 5 shown in FIG. 2 as viewed from a front left side. FIG. 5 is a perspective view in which the R.O.P.S. 5 shown in FIG. 2 is developed. FIG. 6 is a developed view of the vicinity of a curved portion 50 a of a front side roof 50 of the R.O.P.S. 5 shown in FIG. 2. FIG. 7 is a developed view of the vicinity of a connecting portion 71 at a rear side of the R.O.P.S. 5 shown in FIG. 2. FIG. 8 is a perspective view of a state in which a rear support 70 is removed from the R.O.P.S. 5 shown in FIG. 2.

As shown in FIG. 2, the R.O.P.S. 5 includes a pair of left and right front pillars 51, a pair of left and right side beams 52, a pair of left and right rear pillars 53, a front beam 54, and a rear beam 55. The R.O.P.S. 5, for example, is composed of multiple hollow pipe members. The hollow pipe members constituting the R.O.P.S. 5, for example, have a rectangular or circular cross section, and are made of metal. The front pillar 51 extends substantially straight in the obliquely rearward direction of the vehicle body. The side beam 52 extends substantially straight in the longitudinal direction of the vehicle body. The rear pillar 53 extends in the height direction of the vehicle body while being bent. The front beam 54 and the rear beam 55 extend substantially straight in the width direction of the vehicle body. As will be described later, the R.O.P.S. 5 is supported from the rear side by a rear support 70.

The front pillar 51 and the side beam 52 are configured as a front side roof 50 that extends continuously in the longitudinal direction of the vehicle body by bending a single round pipe member into a rounded approximately L-shape. Hereinafter, in the front side roof 50, a portion formed by bending it into the rounded approximately L-shape is referred to as a curved portion 50 a. In the front side roof 50, the front part in the longitudinal direction of the vehicle body than the curved portion 50 a corresponds to the front pillar 51, and the rear part in the longitudinal direction of the vehicle body than the curved portion 50 a corresponds to the side beam 52. Accordingly, the front side roof 50 includes the front pillar 51, the curved portion 50 a, and the side beam 52 in this order from the front side to the rear side of the vehicle body. A front end 511 of the front pillar 51 is fixed to the front bracket 29 a of the front cross member 25 and the front end 22 f of the side frame 22, for example, by bolts and the like. The front end 51 f is formed by fixing the bracket 80 shown in FIG. 15 to a front end part of the front pillar 51 by welding or the like. Furthermore, the front pillar 51 and the side beam 52 may be formed as a separate body and may be fixed to each other via a bracket.

As shown in FIG. 4, the front beam 54 extending in the width direction of the vehicle body is disposed between the left and right front side roofs 50. Specifically, the front beam 54 is disposed on the periphery of the curved portion 50 a of the front side roof 50, that is, on an upper portion of the curved portion 50 a. Furthermore, the front beam 54 may be disposed on the curved portion 50 a of the front side roof 50.

A first bracket 56 is fixed to the upper portion of the curved portion 50 a, for example, by welding. The first bracket 56 has a first mounting portion 56 a, a front pillar mounting portion 56 b, and a side beam mounting portion 56 c. The first mounting portion 56 a has a substantially triangular shape in side view and has a substantially flat plate shape extending in the height direction of the vehicle body. The front pillar mounting portion 56 b is substantially flush with a ridge line 51 a of the front pillar 51 in side view and has a substantially flat plate shape. The side beam mounting portion 56 c is substantially flush with a side ridge line 52 a of the side beam 52 in side view and has a substantially flat plate shape. The front pillar mounting portion 56 b and the side beam mounting portion 56 c are adjacent to each other in the longitudinal direction of the vehicle body. In the first mounting portion 56 a, for example, two first through holes 56 d are formed.

As shown in FIG. 5, the front pillar 51, the curved portion 50 a, and the side beam 52 are formed by bending the front side roof 50 into a rounded approximately L-shape. As a result, as shown in FIG. 6, there is a gap between a virtual front pillar ridge line 51 b formed by extending the ridge line 51 a of the front pillar 51 in side view virtually rearward, and the curved portion 50 a. The front pillar mounting portion 56 b having a substantially flat plate shape is disposed so as to fill the gap and to be aligned with the virtual front pillar ridge line 51 b. Therefore, the ridge line 51 a of the front pillar 51 in side view is substantially flush with the front pillar mounting portion 56 b. Similarly, there is a gap between a virtual side beam ridge line 52 b formed by extending the ridge line 52 a of the side beam 52 in side view virtually frontward, and the curved portion 50 a. The side beam mounting portion 56 c having a substantially flat plate shape is disposed so as to fill the gap and to be aligned with the virtual side beam ridge line 52 b. Therefore, the ridge line 52 a of the side beam 52 in side view is substantially flush with the side beam mounting portion 56 c.

The front pillar mounting portion 56 b and the side beam mounting portion 56 c are disposed so as to be bent at a certain bending angle in side view. As will be described later, on a front surface of the R.O.P.S. 5, a substantially flat front surface part 81 including left and right front pillar mounting portions 56 b is formed, and on an upper surface of the R.O.P.S. 5, a substantially flat upper surface part 82 including left and right side beam mounting portions 56 c is formed. Since the front surface part 81 and the upper surface part 82 are formed as a substantially flat surface, respectively, a plate-like or sheet-like accessory member can be mounted in close contact with the front surface part 81 and the upper surface part 82.

As shown in FIGS. 5 and 6, a second bracket 57 is fixed to each of the left and right side ends 54 s of the front beam 54, for example, by welding. The second bracket 57 has a second mounting portion 57 a, a front support portion 57 b, and a front roof support portion 57 c. The second mounting portion 57 a has a substantially triangular shape in side view, and has a substantially flat plate shape. The front support portion 57 b is substantially flush with the front pillar mounting portion 56 b of the first bracket 56. The front roof support portion 57 c is substantially flush with the side beam mounting portion 56 c of the first bracket 56. If the front support portion 57 b and the front roof support portion 57 c are disposed on the side of the front side roof 50, the front support portion 57 b and the front roof support portion 57 c protrude from the front side roof 50 in the width direction of the vehicle body, and the shapes of the left and right front side roofs 50 are different, and thereby it takes time and effort to assemble the R.O.P.S. 5. Therefore, workability when assembling the R.O.P.S. 5 will be deteriorated. On the other hand, since the front support portion 57 b and the front roof support portion 57 c are provided on the second bracket 57 of the front beam 54, workability when assembling the R.O.P.S. 5 is good.

The second mounting portion 57 a has a substantially triangular shape in side view, and has a substantially flat plate shape extending in the height direction of the vehicle body. In the second mounting portion 57 a, two second through holes 57 d corresponding to the first through holes 56 d of the first mounting portion 56 a are formed. The front support portion 57 b is disposed so as to fit to a front corner portion 58 a formed at an intersection of the front pillar 51 and the front beam 54. The front support portion 57 b has a substantially triangular shape in front view, and has a substantially flat plate shape. In the front support portion 57 b, for example, two penetrating front mounting holes 57 m are formed. The front roof support portion 57 c is disposed so as to fit to a front roof corner portion 58 b formed at an intersection of the front beam 54 and the side beam 52. The front roof support portion 57 c is substantially triangular in plane view, and has a substantially flat plate shape. In the front roof support portion 57 c, for example, two penetrating upper mounting holes 57 n are formed. When the front beam 54 is connected to the front side roof 50, the front support portion 57 b fitted to the front corner portion 58 a, and the front roof support portion 57 c fitted to the front roof corner portion 58 b serve as a gusset, respectively. Therefore, rigidity of the R.O.P.S. 5 is enhanced.

When the front beam 54 is connected to the front side roof 50, the first mounting portion 56 a of the first bracket 56 and the second mounting portion 57 a of the second bracket 57 come into contact with each other in an approximately surface contacted state. Thereafter, the first bracket 56 and the second bracket 57 are fastened, for example, by utilizing the bolts 60 inserted through the first through holes 56 d and the second through holes 57 d, and the nuts. Thereby, the second bracket 57 is fixed to the first bracket 56. As a result, the front beam 54 is fixed to the curved portion 50 a of the front side roof 50. That is, the front beam 54 is fixed to the front side roof 50 constituting the front pillar 51 and the side beam 52.

As shown in FIGS. 5, 7 and 8, a third bracket 59 is fixed to each of the left and right side ends 55 s of the rear beam 55, for example, by welding. The third bracket 59 includes a third mounting portion 59 a, a rear roof support portion 59 b, and a rear support portion 59 c. The third mounting portion 59 a is approximately inverted V-shaped in side view, and has a substantially flat plate shape extending in the height direction of the vehicle body. In the third mounting portion 59 a, for example, two third through holes 59 d are formed. The rear roof support portion 59 b is substantially flush with the ridge line 52 a of the side beam 52 in side view. The rear support portion 59 c is substantially flush with the ridge line 53 g of the rear pillar upper portion 53 a of the rear pillar 53 in side view. As well as the front support portion 57 b and the front roof support portion 57 c, since the rear roof support portion 59 b and the rear support portion 59 c are provided on the third bracket 59 of the rear beam 55, workability when assembling the R.O.P.S. 5 is good.

The rear roof support portion 59 b is disposed so as to fit to a rear roof corner portion 58 c formed at an intersection of the side beam 52 and the rear beam 55. The rear roof support portion 59 b has a substantially triangular shape in plane view, and has a substantially flat plate shape. The rear support portion 59 c is disposed so as to fit to the rear corner portion 58 d formed at an intersection of the rear beam 55 and the rear pillar 53. The rear support portion 59 c has a substantially triangular shape in rear view, and has a substantially flat plate shape. In a rear end 52 r of the side beam 52, for example, two fourth through holes 52 d are formed. The rear end 52 r is formed by fixing the bracket 80 shown in FIG. 15 to a rear end part of the side beam 52 by welding or the like. As will be described later, when the rear beam 55 is connected to the side beam 52 via a connecting portion 71, the rear roof support portion 59 b fits to the rear roof corner portion 58 c, and thereby the rear roof support portion 59 b serves as the gusset. Further, when the rear beam 55 is connected to the rear support 70 via the connecting portion 71, the rear support portion 59 c fits to the rear corner portion 58 d, and thereby the rear support portion 59 c serves as the gusset. Therefore, rigidity of the R.O.P.S. 5 is enhanced by each of the rear roof support portion 59 b and the rear support portion 59 c.

As shown in FIGS. 2 and 4, the rear pillar 53 extends in the height direction of the vehicle body while being bent, and is connected to the rear cross member 27 of the chassis 2. The rear pillar 53 includes a rear pillar upper portion 53 a, a rear pillar bent portion 53 b, and a rear pillar lower portion 53 c in order from an upper side to a lower side of the vehicle body. The rear pillar upper portion 53 a extends rearward from the front side of the vehicle body, and extends obliquely outward in the width direction of the vehicle body. The rear pillar lower portion 53 c extends downward from the upper side of the vehicle body, and extends obliquely from the rear side to the front side of the vehicle body. The rear pillar bent portion 53 b is bent so as to connect the rear pillar upper portion 53 a to the rear pillar lower portion 53 c.

As shown in FIG. 7, in the rear pillar 53, at an upper end 53 u of the rear pillar upper portion 53, for example, two fifth through holes 53 d are formed, and at a lower end 531 of the rear pillar lower portion 53 c, for example, two sixth through holes (no reference number) are formed. The upper end 53 u is formed by fixing the bracket 80 shown in FIG. 15 to an upper end part of the rear pillar 53 by welding or the like. The lower end 531 is formed by fixing the bracket 80 shown in FIG. 15 to a lower end part of the rear pillar lower part 53 c by welding or the like. The lower end 531 of the rear pillar lower portion 53 c is fixed to the front end 27 f of the rear oblique bar portion 27 b of the rear cross member 27 and the rear end 22 r of the side frame 22, for example, via a rear bracket 29 b (shown in FIG. 3) having blind screw holes, by bolts 60 and the like.

The rear pillar 53 has a branch pillar 63 above the rear pillar bent portion 53 b, that is, at the rear pillar upper portion 53 a. The branch pillar 63 extends downward from the upper side of the vehicle body, and extends obliquely rearward. A lower end 631 of the branch pillar 63 is fixed to the chassis 2, that is, to the rear lateral bar portion 27 a of the rear cross member 27, for example, by bolts 60 and the like. Since stress applied to the R.O.P.S. 5 is dispersed to the chassis 2 via the branch pillar 63, rigidity of the R.O.P.S. 5 is enhanced.

As shown in FIGS. 4, 5 and 7, multiple constitutional elements constituting a rear portion of the R.O.P.S. 5, that is, the side beam 52, the rear beam 55, and the rear pillar 53, are connected by the connecting portion 71. Specifically, the rear end 52 r of the side beam 52, the third mounting portion 59 a secured to the side end 55 s of the rear beam 55, and the upper end 53 u of the rear pillar 53 are connected by the connecting portion 71.

Referring to FIGS. 10, 11, 14, 16, 17, and 18, the connecting portion 71 will be described. The connecting portion 71 has a front connecting portion 71 f extending forward, a rear connecting portion 71 r extending rearward, and a lower connecting portion 71 l extending downward. The connecting portion 71 is located on the outer side in the width direction of the vehicle body with respect to the above-described constitutional elements to be connected. The connecting portion 71 has a substantially Y shape in a side view as shown in FIG. 10. And the cross section of the connecting portion 71 has a substantially semicircular shape as shown in FIG. 18.

The front connecting portion 71 f has one third screw hole 71 b and two seventh through holes 71 c. The third screw hole 71 b is located slightly above an imaginary line connecting the seventh through holes 71 c. The front connecting portion 71 f has a flat front mounting surface 71 g on the side facing the rear end 52 r of the side beam 52 to be bolted, that is, on the inner side in the width direction of the vehicle body.

The lower connecting portion 71 l has a flat lower mounting surface 71 m on the side facing the upper end 53 u of the rear pillar 53 to be bolted, that is, on the inner side in the width direction of the vehicle body. The front mounting surface 71 g and the lower mounting surface 71 m are on the same plane and form a flat connection mounting surface 71 y.

The connecting portion 71 has the connection mounting surface 71 y on the inner side in the width direction of the vehicle body. And the rear end 52 r of the side beam 52, the upper end 53 u of the rear pillar 53 and the side end 55 s of the rear beam 55 are fixed to the connection mounting surface 71 y of the connecting portion 71 by bolts. According to this configuration, it is possible to realize an easy and reliable connecting structure between the connecting portion 71 and the side beam 52, between the connecting portion 71 and the rear pillar 53, and between the connecting portion 71 and the rear beam 55.

At a rear end part of the rear connecting portion 71 r, a cylindrical insertion portion 71 u and a flange portion 71 t having a larger diameter than the insertion portion 71 u are provided. The insertion portion 71 u is configured to be insertable into the front end 70 f of the rear support 70. With the insertion portion 71 u inserted in the front end 70 f, the flange portion 71 t is welded to the front end 70 f. Since the connecting portion 71 is fixed to the front end 70 f of the rear support 70 by welding, it is possible to realize a highly rigid and strong connecting structure between the connecting portion 71 and the rear support 70.

The rear end 52 r of the side beam 52, the side end 55 s of the rear beam 55, the upper end 53 u of the rear pillar 53, and the front end 70 f of the rear support 70 are collected and connected at the connecting portion 71. According to this configuration, the number of components can be reduced, and stress applied to the connecting portion 71 can be dispersed.

The connecting portion 71 is made by forging. Since the connecting portion 71 is made by forging, the rigidity of the connecting portion 71 is increased, and the rigidity of the R.O.P.S. 5 is increased.

In the connecting portion 71, third screw holes 71 b corresponding to the third through holes 59 d, seventh screw holes 71 c corresponding to the fourth through holes 52 d, and eighth screw holes 71 d corresponding to the fifth through holes 53 d are formed. The third screw holes 71 b are, for example, blind holes. The third through hole 59 d and the third screw hole 71 b are bolted by using bolts 60. As shown in FIG. 11, the fourth through hole 52 d and the seventh through hole 71 c, the fifth through hole 53 d and the eighth through hole 71 d, respectively, are bolted by using bolts 60 and nuts 61 (for example, a lock nut), and then the bracket 80 can be fixed to the connecting portion 71. The third through holes 59 d, the fourth through holes 52 d, and the fifth through holes 53 d are positioned against the third screw holes 71 b, the seventh screw holes 71 c, and the eighth screw holes 71 d, respectively. In this state, the rear end 52 r, the third mounting portion 59 a, and the upper end 53 u are fastened from the inside or outside in the width direction of the vehicle body to the connection portion 71 by bolts 60, respectively. As a result, the rear end 52 r of the side beam 52, the side end 55 s of the rear beam 55, and the upper end 53 u of the rear pillar 53 are integrally connected via the connecting portion 71. Whether various holes in the connecting portion 71, the third bracket 59, the rear end 52 r and the upper end 53 u are formed as through holes or screw holes can be appropriately selected.

The connecting portion 71 is fixed to the front end 70 f of the rear support 70, for example, by welding or bolts, and is integrated with the rear support 70. Therefore, the side beam 52, the rear beam 55, the rear pillar 53, and the rear support 70 are integrally connected by the connecting portion 71. A rear end 70 r of the rear support 70 is connected to the rear portion 2R of the chassis 2, for example, by welding or bolts, and is preferably connected to the chassis 2 as rearward as possible in the longitudinal direction of the chassis 2. Specifically, the rear end 70 r of the rear support 70 is connected to the rear curved frame portion 24 c of the rear frame 24 so as to be located rearward of the carrier 6 in the longitudinal direction of the vehicle body. The rear end 70 r is formed by fixing the bracket 80 shown in FIG. 15 to a rear end part of the rear support 70 by welding or the like. By locating the rear support 70 rearward of the carrier 6, the carrier 6 is protected, stress applied to the R.O.P.S. 5 is dispersed more effectively, and thereby rigidity of the R.O.P.S. 5 is enhanced.

As shown in FIG. 3, the rear support 70 has an arch shape protruding upward. When stress from the height direction of the vehicle body is applied to the rear support 70, stress is dispersed effectively by the arch shape of the rear support 70, and thereby rigidity of the rear support 70 is enhanced.

As shown in FIG. 3, the connecting portion 71 is configured to be located at the highest position in the vertical direction of the R.O.P.S. 5. According to this configuration, when stress from the height direction of the vehicle body is applied to the R.O.P.S. 5, stress is dispersed more effectively via the connecting portion 71 located at the highest position in the vertical direction of the R.O.P.S. 5, and thereby rigidity of the R.O.P.S. 5 is enhanced.

As shown in FIG. 15, the above-described bracket 80 has a welding portion 81 and a bolting portion 82. The welding portion 81 is composed of a cylindrical insertion part and a flange part having a larger diameter than the insertion part. The insertion part is configured to be insertable into corresponding round pipe members such as the front side roof 50 and the rear support 70. The flange part is welded to an end part of the corresponding round pipe member. The bolting portion 82 has two through holes 84 for inserting a shaft portion of the bolt 60. The bolting portion 82 has a flat mounting surface 83 on a side facing an object to be bolted, such as the connecting portion 71. The bracket 80 is made by forging.

The rear end 52 r of the side beam 52 is made by forging and is fixed to the rear end part of the side beam 52 by welding, and the upper end 53 u of the rear pillar 53 is made by forging and is fixed to the upper end part of the rear pillar 53 by welding. According to this configuration, it is possible to realize a highly rigid and strong connecting structure between the connecting portion 71 and the side beam 52, and between the connecting portion 71 and the rear pillar 53.

As shown in FIGS. 3 and 4, ridge lines 51 a of the front pillars 51 in side view, a ridge line 54 a of the front beam 54 when viewed obliquely downward and frontward from the rear side, and the front pillar mounting portion 56 b of the first bracket 56 are substantially on the same plane. As a result, the front surface part 81 is formed by the ridge lines 51 a of the front pillars 51, the ridge line 54 a of the front beam 54, and the mounting portions 56 b. The front surface part 81 serves as a front mounting portion to which a plate-like or sheet-like accessory member is mounted. The front face portion 81 serving as the front mounting portion is substantially flat. The front support portion 57 b of the second bracket 57 is substantially flush with the front surface part 81 serving as the front mounting portion, and is substantially flat. Therefore, it is easy to arrange and mount the accessory member to the front support portion 57 b.

As the accessory member covering a front part of the R.O.P.S. 5, for example, the windshield 91 (shown in FIG. 3 by a dotted line) made of a transparent resin is configured to be mountable in close contact with the front surface part 81. The windshield 91 has a plate shape or a sheet shape, and has left and right side end portions (not shown) and left and right upper corner portions (not shown). The upper corner portion of the windshield 91 corresponds to the front support portion 57 b, and the front support portion 57 b is used for mounting and supporting the upper corner portion of the windshield 91. Therefore, mounting property of the windshield 91 is improved.

Similarly, ridge lines 52 a of the left and right side beams 52 in side view, a ridge line 54 b of the front beam 54 in front view, a ridge line 55 a of the rear beam 55 in rear view, and the side beam mounting portion 56 c of the first bracket 56 are substantially on the same plane. As a result, the upper surface part 82 being substantially flat is formed on the upper surface of the R.O.P.S. 5 by the ridge lines 52 a of the right side beams 52, the ridge line 54 b of the front beam 54, the ridge line 55 a of the rear beam 55, and the mounting portions 56 c. The upper surface part 82 serves as an upper mounting portion to which the plate-like or sheet-like accessory member is mounted. The front roof support portion 57 c of the second bracket 57 and the rear roof support portion 59 b of the third bracket 59 are substantially flush with the upper surface part 82 serving as the upper mounting portion, and are substantially flat. Therefore, it is easy to arrange and mount the accessory member to the front roof support portion 57 c and the rear roof support portion 59 b.

As an accessory member covering an upper part of the R.O.P.S. 5, for example, the roof 92 (shown in FIG. 3 by a dotted line) which is colored and made of resin is configured to be mountable in close contact with the upper surface part 82. The roof 92 has a plate shape or a sheet shape, and has left and right side end portions (not shown), left and right front corner portions (not shown), and right and left rear corner portions (not shown). The front corner portion of the roof 92 corresponds to the front roof support portions 57 c, and the front roof support portion 57 c is used for mounting and supporting the front corner portion of the roof 92. Therefore, mounting property of the roof 92 is improved. Similarly, the rear corner portion of the roof 92 corresponds to the rear roof support portions 59 b, and the rear roof support portion 59 b is used for mounting and supporting the rear corner portion of the roof 92. Therefore, mounting property of the roof 92 is improved.

Further, as shown in FIG. 8, ridge lines 53 g at upper parts of the rear pillar upper portions 53 a above the branch pillars 63 in side view, ridge lines 63 a of the branch pillars 63 in side view, and the ridge line 55 b of the rear beam 55 when viewed obliquely downward from the front side to the rear side are substantially on the same plane. As a result, the rear surface part 83 being substantially flat is formed by the ridge lines 53 g, the ridge lines 63 a, and the ridge line 55 b. The rear surface part 83 serves as a rear mounting portion to which the plate-like or sheet-like accessory member is mounted. The rear support portion 59 c of the third bracket 59 is substantially flush with the rear surface part 83 serving as the rear mounting portion, and is substantially flat. Therefore, it is easy to arrange and mount the accessory member to the rear support portion 59 c.

As an accessory member covering a rear part of the R.O.P.S. 5, for example, the rear windshield 93 (shown in FIG. 3 by a dotted line) made of a transparent resin is configured to be mountable in close contact with the rear surface part 83. The rear windshield 93 has a plate shape or a sheet shape, and has left and right side end portions (not shown) and left and right upper corner portions (not shown). The upper corner portion of the rear windshield 93 corresponds to the rear support portion 59 c, and the rear support portion 59 c is used for mounting and supporting the upper corner portion of the rear windshield 93. Therefore, mounting property of the rear windshield 93 is improved.

In addition to the front surface part 81, the upper surface part 82 and the rear surface part 83 which serve as mounting portions, the support portions 57 b, 57 c, 59 b, 59 c disposed at the respective corner portions 58 a, 58 b, 58 c, 58 d are used for mounting the plate-like or sheet-like accessory members 91, 92, 93. Therefore, mounting property of the accessory members 91, 92, 93 is improved.

If there is a level difference at the front surface part 81, the upper surface part 82 and the rear surface part 83 of the R.O.P.S. 5, a spacer for eliminating the level difference is necessary. However, in the R.O.P.S. 5 of the above embodiment, since the front surface part 81, the upper surface part 82, and the rear surface part 83 are formed substantially on the same plane so as to eliminate substantially the level difference, the spacer becomes unnecessary. At the same time, the plate-like or sheet-like accessory member (for example, the windshield 91, the roof 92, the rear windshield 93) can be surely and easily mounted.

As described above, a utility vehicle 1 according to one aspect of the present invention, comprising:

a chassis 2; and

a R.O.P.S. 5 provided on the chassis and surrounding a cabin S,

wherein the R.O.P.S. 5 includes a pair of left and right front pillars 51, a pair of left and right side beams 52, a pair of left and right rear pillars 53, and a front beam 54 and a rear beam 55 which extend in a width direction of a vehicle body,

wherein a rear support 70 supporting the R.O.P.S. 5 from a rear is connected to a rear portion 2R of the chassis 2, and

wherein a rear end 52 r of the side beam 52, a side end 55 s of the rear beam 55, an upper end 53 u of the rear pillar 53, and a front end 70 f of the rear support 70 are connected by a connecting portion 71.

According to the configuration, since the rear support 70 that supports the R.O.P.S. 5 from the rear and is connected to the rear portion 2R of the chassis 2, and the R.O.P.S. 5 are connected by the connecting portion 71, when stress from the longitudinal direction of the vehicle body, the width direction of the vehicle body and the height direction of the vehicle body is applied to the R.O.P.S. 5, stress is dispersed to the chassis 2 via the connecting portion 71 and the rear support 70, and thereby rigidity of the R.O.P.S. 5 is enhanced.

In one embodiment, the connecting portion 71 is made by forging.

According to the configuration, the rigidity of the connecting portion 71 is increased, and the rigidity of the R.O.P.S. 5 is increased.

In one embodiment, the connecting portion 71 is located at the highest position in the vertical direction of the R.O.P.S. 5.

According to the configuration, when stress from the height direction of the vehicle body is applied to the R.O.P.S. 5, stress is dispersed more effectively via the connecting portion 71 located at the highest position in the vertical direction of the R.O.P.S. 5, and thereby rigidity of the R.O.P.S. 5 is enhanced.

In one embodiment, the rear pillar 53 has a branch pillar 63 extending downward and connected to the chassis 2.

According to the configuration, since stress applied to the R.O.P.S. 5 is dispersed to the chassis 2 via the branch pillar 63, rigidity of the R.O.P.S. 5 is enhanced.

In one embodiment, the rear support 70 has an arch shape protruding upward.

According to the configuration, when stress from the height direction of the vehicle body is applied to the rear support 70, stress is dispersed effectively by the arch shape of the rear support 70, and thereby rigidity of the rear support 70 is enhanced.

In one embodiment, a carrier 6 is disposed behind the R.O.P.S. 5, and a rear end 70 r of the rear support 70 is located rearward of the carrier 6 in a longitudinal direction of the vehicle body.

According to the configuration, the carrier 6 is protected by the rear support 70, stress applied to the R.O.P.S. 5 is dispersed more effectively, and thereby rigidity of the R.O.P.S. 5 is enhanced.

In one embodiment, the connecting portion 71 is fixed to the front end 70 f of the rear support 70 by welding.

According to the configuration, it is possible to realize a highly rigid and strong connecting structure between the connecting portion 71 and the rear support 70.

In one embodiment, the rear end 52 r of the side beam 52 is made by forging and is fixed to a rear end part of the side beam 52 by welding, and the upper end 53 u of the rear pillar 53 is made by forging and is fixed to an upper end part of the rear pillar 53 by welding.

According to the configuration, it is possible to realize a highly rigid and strong connecting structure between the connecting portion 71 and the side beam 52, and between the connecting portion 71 and the rear pillar 53.

In one embodiment, the connecting portion 71 has a connection mounting surface 71 y on an inner side in the width direction of the vehicle body, and wherein the rear end 52 r of the side beam 52, the upper end 53 u of the rear pillar 53, and the side end 55 s of the rear beam 55 are fixed to the connection mounting surface 71 y of the connecting portion 71 by bolts.

According to the configuration, it is possible to realize an easy and reliable connecting structure between the connecting portion 71 and the side beam 52, between the connecting portion 71 and the rear pillar 53, and between the connecting portion 71 and the rear beam 55.

Although the embodiments have been specifically described to exemplify the technical feature of the present invention as an example, the embodiments are not limited to the above-mentioned embodiments. Various constitutional elements are merely examples for explaining the embodiments, and do not limit them, and hence, various modifications, alterations, additions and omissions and the like of the present invention can be made within scope of claims or within a range equivalent to scope of claims. 

What is claimed is:
 1. A utility vehicle comprising: a chassis; and a roll-over protective structure provided on the chassis and surrounding a cabin, wherein the roll-over protective structure includes a pair of left and right front pillars, a pair of left and right side beams, a pair of left and right rear pillars, and a front beam and a rear beam which extend in a width direction of a vehicle body, wherein a rear support supporting the roll-over protective structure is connected to a rear portion of the chassis, wherein a rear end of the side beam, a side end of the rear beam, an upper end of the rear pillar, and a front end of the rear support are connected by a connecting portion, wherein the connecting portion has a front mounting surface and a lower mounting surface on an inner side in a width direction of the vehicle body, and wherein the front mounting surface and the lower mounting surface are on the same plane and form a flat connection mounting surface.
 2. The utility vehicle according to claim 1, wherein the connecting portion is made by forging.
 3. The utility vehicle according to claim 1, wherein the connecting portion is located at the highest position in a vertical direction of the roll-over protective structure.
 4. The utility vehicle according to claim 1, wherein the rear pillar has a branch pillar extending downward and connected to the chassis.
 5. The utility vehicle according to claim 1, wherein the rear support has an arch shape protruding upward.
 6. The utility vehicle according to claim 1, wherein a carrier is disposed behind the roll-over protective structure, and a rear end of the rear support is located rearward of the carrier in a longitudinal direction of the vehicle body.
 7. The utility vehicle according to claim 1, wherein the connecting portion is fixed to the front end of the rear support by welding.
 8. The utility vehicle according to claim 1, wherein the connecting portion has a rear connecting portion for connecting the front end of the rear support, and the rear connecting portion extends diagonally backward along an extending direction of the connection mounting surface.
 9. The utility vehicle according to claim 1, wherein a profile of the connecting portion on the opposite side of the connection mounting surface has a shape that is continuous with a profile of the side beam and a profile of the rear pillar.
 10. The utility vehicle according to claim 1, wherein the rear end of the side beam, the upper end of the rear pillar, and the side end of the rear beam are fixed to the connection mounting surface of the connecting portion by bolts.
 11. A utility vehicle comprising: a chassis; and a roll-over protective structure provided on the chassis and surrounding a cabin, wherein the roll-over protective structure includes a pair of left and right front pillars, a pair of left and right side beams, a pair of left and right rear pillars, and a front beam and a rear beam which extend in a width direction of a vehicle body, wherein a rear support supporting the roll-over protective structure is connected to a rear portion of the chassis, wherein a rear end of the side beam, a side end of the rear beam, an upper end of the rear pillar, and a front end of the rear support are connected by a connecting portion wherein the rear end of the side beam is made by forging and is fixed to a rear end part of the side beam by welding, and wherein the upper end of the rear pillar is made by forging and is fixed to an upper end part of the rear pillar by welding. 